WO2022120792A1

WO2022120792A1 - Optical system, camera module, and terminal device

Info

Publication number: WO2022120792A1
Application number: PCT/CN2020/135666
Authority: WO
Inventors: 杨健; 李明
Original assignee: 欧菲光集团股份有限公司; 江西晶超光学有限公司
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2022-06-16

Abstract

An optical system, a camera module, and a terminal device. The optical system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens and the fourth lens have refractive power, the second lens and the fifth lens have positive refractive power, and the third lens and the sixth lens have negative refractive power. The positions of an object-side surface and an image-side surface of the second lens close to an optical axis are both convex surfaces, the position of an image-side surface of the third lens close to the optical axis is a concave surface, the position of an image-side surface of the fifth lens close to the optical axis is a convex surface, and the position of an image-side surface of the sixth lens close to the optical axis is a concave surface. The optical system satisfies that 0.1<cts/sds<2. By reasonably configuring the refractive power and surface type of the first lens to the sixth lens in the optical system, and defining cts/sds, the system achieves miniaturization, large field of view and high-pixel imaging quality, and reduces the aperture size of the terminal device.

Description

Optical system, camera module and terminal equipment

technical field

The present application belongs to the technical field of optical imaging, and in particular relates to an optical system, a camera module and a terminal device.

Background technique

In recent years, a full-screen mobile phone has become popular in the market, and it can be seen that high screen ratio has become a development trend. In this trend, the size of the optical system for photography is facing the requirement of miniaturization, and at the same time, the high image quality must be guaranteed, so the specification requirements of the optical system are also getting higher and higher.

Although the current optical system can meet the requirements of miniaturization, the head of the optical system is large, which is not conducive to the under-screen packaging of the optical system, and the screen opening is large, which cannot achieve the visual effect of a full screen, and the current optical system has a field of view. The angle is small, which cannot meet the needs of users for taking pictures.

Therefore, how to realize the miniaturization of the optical system, the large field of view, and the high-pixel imaging quality at the same time, and how to reduce the opening size of the terminal equipment should be the research and development direction of the industry.

SUMMARY OF THE INVENTION

Embodiments of the present application provide an optical system, a camera module, and a terminal device. The optical system can achieve miniaturization, a large field of view, and high-pixel imaging quality, and reduce the size of an opening of the terminal device.

In a first aspect, an embodiment of the present application provides an optical system, the optical system includes a plurality of lenses, and the plurality of lenses includes from the object side (the object side refers to the side where light enters) to the image side (the image side is Refers to the side where the light exits) the first lens arranged in sequence has refractive power; the second lens has positive refractive power, and the object side and the image side of the second lens are convex at the near optical axis; the third lens has a positive refractive power. The lens has negative refractive power, and the image side of the third lens is concave at the near optical axis; the fourth lens has refractive power; the fifth lens has positive refractive power, and the image side of the fifth lens is near the optical axis. The optical axis is convex; the sixth lens has negative refractive power, and the image side of the sixth lens is concave at the near optical axis; the optical system also includes a diaphragm, and the optical system satisfies the following conditional formula: 0.1 <cts/sds<2, cts is the distance from the intersection of the diaphragm and the optical axis to the intersection of the object side surface of the first lens and the optical axis, and sds is half of the aperture of the diaphragm.

Among them, the refractive power is the optical power, which represents the ability of the optical system to deflect the light. The positive refractive power means that the lens has a converging effect on the light beam, and the negative refractive power means that the lens has a divergent effect on the light beam. When the lens has no refractive power, that is, when the optical power is zero, it is plane refraction. At this time, the parallel beam along the axis is still a parallel beam along the axis after refraction, and no refractive phenomenon occurs. The fact that the first lens and the fourth lens have refractive power in this application means that the first lens and the fourth lens may have positive refractive power, and the first lens and the fourth lens may also have negative refractive power.

In this application, the optical system can be miniaturized by rationally configuring the refractive power of the first lens to the sixth lens, the surface shapes of the second lens, the third lens, the fifth lens, and the sixth lens, and limiting cts/sds. , large field of view and high pixel imaging quality, and reduce the size of the opening of the terminal equipment. The optical system of the present application can reduce the size of the screen opening of the terminal device under the premise of ensuring high imaging quality, which is beneficial to the under-screen packaging of the optical system and achieves the visual effect of a full screen. A wider field of view can be obtained, and foreground objects can be highlighted to satisfy the user's photographing experience.

Specifically, the aperture of the present application is located on the object side of the first lens and is far away from the first lens (that is, the aperture is moved forward), and the aperture of the aperture is small. Placing the aperture with a small aperture in front of the aperture can make the screen opening smaller. Can also meet the light. By defining cts/sds, the front diaphragm is kept away from the first lens, and the diaphragm is arranged on the protective glass to reduce the size of the screen opening of the terminal device. Keep a certain distance between the protective glass and the lens. The farther the distance is, the larger the amount of light will pass, and the lower the MTF performance. Therefore, the farther the distance is, the smaller the aperture diameter needs to be to balance the aberration, so cts/sds>0.1, otherwise it will affect the optical The imaging quality of the system; but the aperture diameter cannot be too small, otherwise the aperture number of the optical system will increase, the diffraction limit will decrease, and the imaging quality of the optical system will also be affected, so cts/sds<2.

In an embodiment, the object side surface and the image side surface of the first lens to the sixth lens are all aspherical surfaces, which is beneficial to correct the aberration of the optical system and improve the imaging quality of the optical system.

In one embodiment, the optical system satisfies the conditional formula: -20°<slopeL1S1<-0.5°, where slopeL1S1 is the inclination angle at the maximum effective aperture of the object side of the first lens. By limiting slopeL1S1 to a negative number, it is used to reduce the angle between the incident light and the object side of the first lens and balance the aberration. If the angle is too large, the chromatic aberration will increase, the relative brightness will decrease, and the image quality will be affected.

In an embodiment, the optical system satisfies the conditional formula: -1<f12/f36<-0.3, f12 is the combined focal length of the first lens and the second lens, and f36 is the third lens to the The combined focal length of the sixth lens. Reasonably limiting the range of f12/f36 is beneficial to reduce the impact of chromatic aberration on the performance of the optical system. If f12/f36 <-1, the refractive power will be distributed to the third lens to the sixth lens, and the sensitivity will increase, which is not conducive to the assembly volume. If f12/f36>-0.3, it will affect the MTF performance of the optical system.

In one embodiment, the optical system satisfies the conditional formula: 0<(R61+R62)/(R61-R62)<2, R61 is the radius of curvature of the object side of the sixth lens at the optical axis, and R62 is The curvature radius of the image side surface of the sixth lens at the optical axis. Reasonably limiting the range of (R61+R62)/(R61-R62) can make the system match the incident angle of the main light of the photosensitive chip well. If (R61+R62)/(R61-R62)>2, the incident angle of the chief ray of the inner field of view cannot be increased, and there will be problems in matching the incident angle of the chief ray of the photosensitive chip, which cannot meet the mass production requirements.

In one embodiment, the optical system satisfies the conditional formula: 2<FNO<4, where FNO is the aperture number of the optical system. By limiting the range of FNO, a large amount of light passing through the optical system can also be achieved under the condition that the optical system has a small head. When the amount of light passing through the optical system is large, clear imaging can be achieved even when shooting in a dark environment. If the FNO is too large, on the one hand, the diffraction limit will be reduced, and on the other hand, the light throughput will be reduced, which is not conducive to shooting in a dark environment.

In one embodiment, the optical system satisfies the conditional formula: 1.25<TTL/f<1.5, TTL is the distance from the object side of the first lens in the optical system to the imaging surface on the optical axis, and f is the the focal length of the optical system. By reasonably limiting the range of TTL/f, it is helpful to determine the optional range of focal length while meeting the requirements of miniaturization. A longer TTL is required. If the focal length is too large, the maximum field of view of the optical system will be small, and the TTL will be increased accordingly, which is not conducive to the miniaturization of the optical system.

In one embodiment, the optical system satisfies the conditional formula: 1.5<TTL/Imgh<1.7, TTL is the distance from the object side of the first lens in the optical system to the imaging surface on the optical axis, and ImgH is the Half of the image height corresponding to the maximum angle of view of the optical system. By limiting 1.5<TTL/Imgh<1.7, the total length of the system can be guaranteed to be small when the image plane is fixed, and miniaturization requirements can be achieved; if TTL/Imgh>1.7, the total length of the system is too long and cannot be miniaturized.

In a second aspect, the present application provides a camera module, comprising a photosensitive element and the optical system according to any one of the foregoing embodiments, wherein the photosensitive element is located on the image side of the optical system.

In a third aspect, the present application provides a terminal device, including the camera module.

By rationally configuring the refractive power of the first lens to the sixth lens in the optical system and the surface shapes of the second lens, the third lens, the fifth lens and the sixth lens and the limited cts/sds, the optical system can be miniaturized and large. Field of view and high pixel imaging quality, and reduce the size of the opening of the terminal equipment.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the accompanying drawings required in the embodiments or the background technology of the present application will be described below.

1 is a schematic structural diagram of a first lens provided by the present application;

2 is a schematic structural diagram of an optical system provided by the first embodiment of the present application;

3 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the first embodiment;

4 is a schematic structural diagram of an optical system provided by a second embodiment of the present application;

5 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the second embodiment;

6 is a schematic structural diagram of an optical system provided by a third embodiment of the present application;

7 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the third embodiment;

8 is a schematic structural diagram of an optical system provided by a fourth embodiment of the present application;

9 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the fourth embodiment;

10 is a schematic structural diagram of an optical system provided by a fifth embodiment of the present application;

11 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the fifth embodiment;

12 is a schematic structural diagram of an optical system provided by the sixth embodiment of the present application;

13 is a longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the sixth embodiment;

FIG. 14 is a schematic diagram of the application of the optical system provided in the present application in a terminal device.

Detailed ways

The embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

An optical system provided by the present application includes six lenses, and the six lenses are sequentially distributed from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. .

Specifically, the surface shape and refractive power of the six lenses are as follows:

The first lens has a refractive power; the second lens has a positive refractive power, and both the object side and the image side of the second lens are convex at the near optical axis; the third lens has a negative refractive power, and the third lens has a negative refractive power. The image side of the lens is concave at the near optical axis; the fourth lens has refractive power; the fifth lens has positive refractive power, and the image side of the fifth lens is convex at the near optical axis; the sixth lens has Negative refractive power, the image side surface of the sixth lens is concave at the near optical axis.

The optical system further includes a diaphragm, and the optical system satisfies the following conditional formula: 0.1<cts/sds<2, cts is the intersection of the diaphragm and the optical axis to the distance between the object side surface of the first lens and the optical axis. The distance between the intersection points, sds is half of the aperture of the diaphragm.

By rationally configuring the refractive power of the first lens to the sixth lens in the optical system, the surface shapes of the second lens, the third lens, the fifth lens and the sixth lens, and the limited cts/sds, the optical system can be miniaturized and large. Field of view and high pixel imaging quality, and reduce the size of the opening of the terminal equipment. The optical system of the present application can reduce the size of the screen opening of the terminal device under the premise of ensuring high imaging quality, which is beneficial to the under-screen packaging of the optical system and achieves the visual effect of a full screen. A wider field of view can be obtained, and foreground objects can be highlighted to satisfy the user's photographing experience.

Specifically, the aperture of the present application is located on the object side of the first lens and is far away from the first lens (that is, the aperture is moved forward), and the aperture of the aperture is small. Placing the aperture with a small aperture in front of the aperture can make the screen opening smaller. Can also meet the light. By defining cts/sds, the front diaphragm is kept away from the first lens, and the diaphragm is arranged on the protective glass to reduce the size of the screen opening of the terminal device. Keep a certain distance between the protective glass and the lens. The farther the distance is, the greater the amount of light passing through is, and the lower the MTF performance. Therefore, the farther the distance is, the smaller the aperture diameter needs to be to balance the aberration, so cts/sds>0.1, otherwise it will affect the optics. The imaging quality of the system; but the aperture diameter cannot be too small, otherwise the aperture number of the optical system will increase, the diffraction limit will decrease, and the imaging quality of the optical system will also be affected, so cts/sds<2.

Specifically, referring to FIG. 1, a tangent is made at the maximum effective aperture of the object side of the first lens L1, the direction of the tangent is the tangential direction, the direction perpendicular to the optical axis is the vertical optical axis direction, and slopeL1S1 is the object of the first lens. The angle between the tangential direction at the maximum effective aperture of the side surface and the vertical optical axis direction, in other words, the inclination angle of the tangential direction at the maximum effective aperture on the object side of the first lens relative to the vertical optical axis direction is slopeL1S1. Taking the structure of FIG. 1 as an example, the tangential direction is on the left side of the vertical optical axis, then slopeL1S1 is negative, and if the tangential direction is on the right side of the vertical optical axis, then slopeL1S1 is positive (it should be pointed out that it is mentioned in the embodiments of this application. The orientation terms, such as "left", "right", etc., only refer to the directions of the drawings. Therefore, the orientation terms used are for better and clearer description and understanding of the embodiments of the present application, rather than indicating or It is implied that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application).

In one embodiment, the optical system satisfies the conditional formula: 0<(R61+R62)/(R61-R62)<2, R61 is the radius of curvature of the object side of the sixth lens at the optical axis, and R62 is The curvature radius of the image side of the sixth lens at the optical axis. Reasonably limiting the range of (R61+R62)/(R61-R62) can make the system match the incident angle of the main light of the photosensitive chip well. If (R61+R62)/(R61-R62)>2, the incident angle of the chief ray of the inner field of view cannot be increased, and there will be problems in matching the incident angle of the chief ray of the photosensitive chip, which cannot meet the mass production requirements.

In one embodiment, the optical system satisfies the conditional formula: 1.5<TTL/Imgh<1.7, TTL is the distance from the object side of the first lens in the optical system to the imaging surface on the optical axis, and ImgH is the Half of the image height corresponding to the maximum angle of view of the optical system. By limiting TTL/Imgh<1.7, the total length of the system can be guaranteed to be small when the image plane is fixed, and miniaturization requirements are achieved; if TTL/Imgh>1.7, the total length of the system is too long and miniaturization cannot be achieved.

The present application will be described in detail below through six specific embodiments.

Example 1

As shown in FIG. 2 , the straight line 11 represents the optical axis, the side of the first lens L1 away from the second lens L2 is the object side 12 , and the side of the sixth lens L6 away from the fifth lens L5 is the image side 13 . In the optical system provided in this embodiment, from the object side 12 to the image side 13 are the diaphragm STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the Six lenses L6, infrared filter element IRCF.

The first lens L1 has a positive refractive power and is made of plastic material, its object side S1 is convex at the near optical axis, its object side S1 is concave at the circumference, and its image side S2 is concave at the near optical axis, and its image is concave at the near optical axis. The side surface S2 is convex at the circumference, and both are aspherical.

The second lens L2 has a positive refractive power and is made of plastic material, its object side S3 is convex at the near optical axis and at the circumference, its image side S4 is convex at the near optical axis, and its image side S4 is at the circumference Concave, and both are aspherical.

The third lens L3 has negative refractive power and is made of plastic material. Its object side S5 is concave at the near optical axis, its object side S5 is convex at the circumference, and its image side S6 is at the near optical axis and at the circumference. Concave, and both are aspherical.

The fourth lens L4 has negative refractive power and is made of plastic material, and its object side surface S7 is concave at the near optical axis and at the circumference, and its image side S8 is concave at the near optical axis and at the circumference, and both are non-concave. spherical.

The fifth lens L5 has a positive refractive power and is made of plastic material, and its object side surface S9 is convex at the near-optical axis and at the circumference, and its image side S10 is convex at the near-optical axis and at the circumference, and both are non-convex. spherical.

The sixth lens L6 has a negative refractive power and is made of plastic material, its object side S11 is convex at the near optical axis, its object side S11 is concave at the circumference, its image side S12 is concave at the near optical axis, and its image is concave at the near optical axis. The side surface S12 is convex at the circumference, and all are aspherical.

The diaphragm STO may be located on the object side of the first lens L1 or between any two adjacent lenses, and the diaphragm STO in this embodiment is disposed on the object side of the first lens L1 and is disposed away from the first lens L1 .

The infrared filter element IRCF is arranged after the sixth lens L6, including the object side S13 and the image side S14. The infrared filter element IRCF is used to filter out infrared light, so that the light entering the imaging surface is visible light, and the wavelength of visible light is 380nm- 780nm, the material of the infrared filter element IRCF is glass.

The imaging plane S15 is the plane where the image formed by the light of the subject passing through the optical system is located.

Table 1a shows the characteristic table of the optical system of this embodiment, wherein the radius of curvature in this embodiment is the radius of curvature of each lens at the near optical axis, the reference wavelength of the focal length is 555 nm, the refractive index and the Abbe number are The reference wavelength is 587.56nm.

Table 1a

Among them, f is the focal length of the optical system, FNO is the aperture number of the optical system, FOV is the maximum field angle of the optical system, and TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis.

In this embodiment, the object side surface and the image side surface of the first lens L1 to the sixth lens L6 are all aspherical surfaces, and the surface type of each aspherical lens can be limited by but not limited to the following aspherical surface formulas:

where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the surface vertex, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, k is the conic constant, and Ai is the aspheric surface formula The coefficients corresponding to the higher-order terms of the i-th term in .

Table 1b shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20.

Table 1b

面序号face number	KK	A4A4	A6A6	A8A8	A10A10
S1S1	-5.4635E+00-5.4635E+00	-5.8490E-02-5.8490E-02	-4.5590E-02-4.5590E-02	-4.6829E-01-4.6829E-01	2.5593E+002.5593E+00
S2S2	-9.9683E+00-9.9683E+00	-3.2351E-01-3.2351E-01	-1.3229E-01-1.3229E-01	-1.1931E-01-1.1931E-01	2.5125E+002.5125E+00
S3S3	-1.2944E+01-1.2944E+01	-1.0168E-01-1.0168E-01	-3.4724E-01-3.4724E-01	6.7191E-016.7191E-01	-1.1030E+00-1.1030E+00

S4S4	-7.0741E+01-7.0741E+01	3.9400E-023.9400E-02	-1.6651E+00-1.6651E+00	6.1742E+006.1742E+00	-1.2683E+01-1.2683E+01
S5S5	-7.9849E+00-7.9849E+00	-7.6360E-02-7.6360E-02	-1.7177E+00-1.7177E+00	8.0160E+008.0160E+00	-1.7352E+01-1.7352E+01
S6S6	-1.5840E+01-1.5840E+01	-8.5640E-02-8.5640E-02	-1.1304E-01-1.1304E-01	1.2965E+001.2965E+00	-2.7361E+00-2.7361E+00
S7S7	-1.0000E+01-1.0000E+01	-1.1077E-01-1.1077E-01	6.1441E-016.1441E-01	-2.0928E+00-2.0928E+00	4.2239E+004.2239E+00
S8S8	0.0000E+000.0000E+00	-2.1897E-01-2.1897E-01	8.2385E-018.2385E-01	-2.3311E+00-2.3311E+00	4.0655E+004.0655E+00
S9S9	9.3324E+009.3324E+00	-2.7520E-02-2.7520E-02	2.4336E-012.4336E-01	-9.5994E-01-9.5994E-01	1.6303E+001.6303E+00
S10S10	-9.2314E+00-9.2314E+00	-2.4500E-03-2.4500E-03	1.3154E-011.3154E-01	-3.5316E-01-3.5316E-01	3.6921E-013.6921E-01
S11S11	4.3858E+004.3858E+00	-2.3880E-01-2.3880E-01	1.4951E-011.4951E-01	-1.3459E-01-1.3459E-01	1.0411E-011.0411E-01
S12S12	-4.9115E+00-4.9115E+00	-1.2228E-01-1.2228E-01	7.6730E-027.6730E-02	-3.9810E-02-3.9810E-02	1.5350E-021.5350E-02
面序号face number	A12A12	A14A14	A16A16	A18A18	A20A20
S1S1	-8.4044E+00-8.4044E+00	1.5808E+011.5808E+01	-1.6401E+01-1.6401E+01	8.5642E+008.5642E+00	-1.7232E+00-1.7232E+00
S2S2	-6.9455E+00-6.9455E+00	1.0375E+011.0375E+01	-8.7894E+00-8.7894E+00	3.7804E+003.7804E+00	-6.1654E-01-6.1654E-01
S3S3	3.3930E+003.3930E+00	-5.7440E+00-5.7440E+00	4.8759E+004.8759E+00	-2.0671E+00-2.0671E+00	3.5264E-013.5264E-01
S4S4	1.5995E+011.5995E+01	-1.2775E+01-1.2775E+01	6.4034E+006.4034E+00	-1.8652E+00-1.8652E+00	2.4318E-012.4318E-01
S5S5	2.1976E+012.1976E+01	-1.7436E+01-1.7436E+01	8.6516E+008.6516E+00	-2.4763E+00-2.4763E+00	3.1354E-013.1354E-01
S6S6	2.9258E+002.9258E+00	-1.7594E+00-1.7594E+00	5.6127E-015.6127E-01	-6.8180E-02-6.8180E-02	-2.5200E-03-2.5200E-03
S7S7	-5.4556E+00-5.4556E+00	4.5357E+004.5357E+00	-2.3242E+00-2.3242E+00	6.6505E-016.6505E-01	-8.1340E-02-8.1340E-02
S8S8	-4.4576E+00-4.4576E+00	3.0634E+003.0634E+00	-1.2729E+00-1.2729E+00	2.9209E-012.9209E-01	-2.8460E-02-2.8460E-02
S9S9	-1.5291E+00-1.5291E+00	8.5135E-018.5135E-01	-2.7839E-01-2.7839E-01	4.8460E-024.8460E-02	-3.3600E-03-3.3600E-03
S10S10	-1.6386E-01-1.6386E-01	1.9390E-021.9390E-02	8.1300E-038.1300E-03	-2.8700E-03-2.8700E-03	2.6000E-042.6000E-04
S11S11	-4.6310E-02-4.6310E-02	1.1870E-021.1870E-02	-1.7600E-03-1.7600E-03	1.4000E-041.4000E-04	0.0000E+000.0000E+00
S12S12	-4.0200E-03-4.0200E-03	6.8000E-046.8000E-04	-7.0000E-05-7.0000E-05	0.0000E+000.0000E+00	0.0000E+000.0000E+00

FIG. 3 shows longitudinal spherical aberration curves, astigmatism curves, and distortion curves of the optical system of the first embodiment. Among them, the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical system, and the reference wavelengths of the longitudinal spherical aberration curve are 650.0000nm, 610.0000nm, 555.0000nm, 510.0000nm, 470.0000nm; the astigmatism curve represents Meridional image surface curvature and sagittal image surface curvature, where S represents the sagittal direction, T represents the meridional direction, and the reference wavelength of the astigmatism curve is 555.0000 nm; the distortion curve represents the value of the distortion corresponding to different field angles. The reference wavelength is 555.0000nm. It can be seen from FIG. 3 that the optical system provided in the first embodiment can achieve good imaging quality.

Embodiment 2

As shown in FIG. 4 , the straight line 11 represents the optical axis, the side of the first lens L1 away from the second lens L2 is the object side 12 , and the side of the sixth lens L6 away from the fifth lens L5 is the image side 13 . In the optical system provided in this embodiment, from the object side 12 to the image side 13 are the diaphragm STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the Six lenses L6, infrared filter element IRCF.

The second lens L2 has a positive refractive power and is made of plastic material, its object side S3 is convex at the near optical axis and at the circumference, and its image side S4 is convex at the near optical axis and at the circumference, and both are non-convex spherical.

The fourth lens L4 has a positive refractive power and is made of plastic material, its object side S7 is convex at the near optical axis, its object side S7 is concave at the circumference, its image side S8 is convex at the near optical axis, and its image is convex at the near optical axis. The side surface S8 is concave at the circumference, and all are aspherical.

The fifth lens L5 has a positive refractive power and is a plastic material, its object side S9 is a concave surface at the near optical axis, its object side S9 is a convex surface at the circumference, and its image side S10 is at the near optical axis and at the circumference. Convex, and both are aspherical.

Table 2a shows the characteristic table of the optical system of this embodiment, wherein the radius of curvature in this embodiment is the radius of curvature of each lens at the near optical axis, the reference wavelength of the focal length is 555 nm, the refractive index and the Abbe number are The reference wavelength is 587.56nm.

Table 2a

Table 2b shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

Table 2b

面序号face number	KK	A4A4	A6A6	A8A8	A10A10
S1S1	-5.7639E+00-5.7639E+00	-5.0060E-02-5.0060E-02	-2.2243E-01-2.2243E-01	1.1209E+001.1209E+00	-5.4511E+00-5.4511E+00
S2S2	-8.6624E+00-8.6624E+00	-3.0759E-01-3.0759E-01	-3.3326E-01-3.3326E-01	1.6122E+001.6122E+00	-5.2542E+00-5.2542E+00
S3S3	-1.3206E+01-1.3206E+01	-9.7580E-02-9.7580E-02	-4.5024E-01-4.5024E-01	1.5462E+001.5462E+00	-4.5275E+00-4.5275E+00
S4S4	-5.8074E+01-5.8074E+01	-7.2700E-02-7.2700E-02	-9.0465E-01-9.0465E-01	3.3950E+003.3950E+00	-5.9798E+00-5.9798E+00
S5S5	-1.3282E+01-1.3282E+01	-2.0567E-01-2.0567E-01	-6.7133E-01-6.7133E-01	3.8610E+003.8610E+00	-7.1231E+00-7.1231E+00
S6S6	-1.5029E+01-1.5029E+01	-1.1924E-01-1.1924E-01	2.0431E-012.0431E-01	1.4488E-011.4488E-01	-4.1337E-01-4.1337E-01
S7S7	0.0000E+000.0000E+00	-1.0190E-01-1.0190E-01	3.8836E-013.8836E-01	-1.1967E+00-1.1967E+00	2.4081E+002.4081E+00
S8S8	-1.0000E+01-1.0000E+01	-1.1805E-01-1.1805E-01	4.2216E-014.2216E-01	-1.4353E+00-1.4353E+00	2.8556E+002.8556E+00
S9S9	-1.0000E+01-1.0000E+01	6.8910E-026.8910E-02	7.0130E-027.0130E-02	-7.7225E-01-7.7225E-01	1.5183E+001.5183E+00
S10S10	-7.3903E+00-7.3903E+00	-3.6400E-02-3.6400E-02	2.2339E-012.2339E-01	-5.0419E-01-5.0419E-01	5.2430E-015.2430E-01
S11S11	4.4206E+004.4206E+00	-2.3127E-01-2.3127E-01	1.2733E-011.2733E-01	-8.3700E-02-8.3700E-02	5.6630E-025.6630E-02
S12S12	-4.6193E+00-4.6193E+00	-1.3913E-01-1.3913E-01	9.8720E-029.8720E-02	-5.4100E-02-5.4100E-02	2.1160E-022.1160E-02
面序号face number	A12A12	A14A14	A16A16	A18A18	A20A20
S1S1	1.5525E+011.5525E+01	-2.7763E+01-2.7763E+01	3.1118E+013.1118E+01	-1.9976E+01-1.9976E+01	5.5354E+005.5354E+00
S2S2	1.2888E+011.2888E+01	-2.0166E+01-2.0166E+01	1.9498E+011.9498E+01	-1.0784E+01-1.0784E+01	2.5911E+002.5911E+00
S3S3	1.0669E+011.0669E+01	-1.4815E+01-1.4815E+01	1.1578E+011.1578E+01	-4.8047E+00-4.8047E+00	8.3105E-018.3105E-01
S4S4	5.0941E+005.0941E+00	-1.2057E+00-1.2057E+00	-1.1673E+00-1.1673E+00	8.8704E-018.8704E-01	-1.8055E-01-1.8055E-01
S5S5	5.5625E+005.5625E+00	-4.3143E-01-4.3143E-01	-2.2314E+00-2.2314E+00	1.4193E+001.4193E+00	-2.8158E-01-2.8158E-01
S6S6	8.8000E-048.8000E-04	5.9979E-015.9979E-01	-6.2691E-01-6.2691E-01	2.7350E-012.7350E-01	-4.5540E-02-4.5540E-02
S7S7	-3.2688E+00-3.2688E+00	2.9242E+002.9242E+00	-1.6167E+00-1.6167E+00	4.9639E-014.9639E-01	-6.4690E-02-6.4690E-02
S8S8	-3.4509E+00-3.4509E+00	2.5639E+002.5639E+00	-1.1388E+00-1.1388E+00	2.7747E-012.7747E-01	-2.8580E-02-2.8580E-02
S9S9	-1.5094E+00-1.5094E+00	8.7174E-018.7174E-01	-2.9374E-01-2.9374E-01	5.2570E-025.2570E-02	-3.7400E-03-3.7400E-03
S10S10	-2.6372E-01-2.6372E-01	5.9710E-025.9710E-02	-1.8000E-03-1.8000E-03	-1.5000E-03-1.5000E-03	1.8000E-041.8000E-04
S11S11	-2.3720E-02-2.3720E-02	5.7900E-035.7900E-03	-8.2000E-04-8.2000E-04	6.0000E-056.0000E-05	0.0000E+000.0000E+00

S12

-5.6100E-03

9.7000E-04

-1.0000E-04

1.0000E-05

0.0000E+00

FIG. 5 shows longitudinal spherical aberration curves, astigmatism curves, and distortion curves of the optical system of the second embodiment. Among them, the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical system, and the reference wavelengths of the longitudinal spherical aberration curve are 650.0000nm, 610.0000nm, 555.0000nm, 510.0000nm, 470.0000nm; the astigmatism curve represents Meridional image surface curvature and sagittal image surface curvature, where S represents the sagittal direction, T represents the meridional direction, and the reference wavelength of the astigmatism curve is 555.0000 nm; the distortion curve represents the distortion value corresponding to different field angles. The reference wavelength is 555.0000nm. It can be seen from FIG. 5 that the optical system provided in the second embodiment can achieve good imaging quality.

Embodiment 3

As shown in FIG. 6 , the straight line 11 represents the optical axis, the side of the first lens L1 away from the second lens L2 is the object side 12 , and the side of the sixth lens L6 away from the fifth lens L5 is the image side 13 . In the optical system provided in this embodiment, from the object side 12 to the image side 13 are the diaphragm STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the Six lenses L6, infrared filter element IRCF.

The first lens L1 has a positive refractive power and is made of plastic material, its object side S1 is concave at the near optical axis and at the circumference, and its image side S2 is convex at the near optical axis and at the circumference, and both are non-concave. spherical.

The second lens L2 has a positive refractive power and is made of plastic material. Its object side S3 is convex at the near optical axis and at the circumference, and its image side S4 is convex at the near optical axis and at the circumference, and both are non-convex. spherical.

The third lens L3 has negative refractive power and is made of plastic material, its object side S5 is convex at the near optical axis and at the circumference, its image side S6 is concave at the near optical axis, and its image side S6 is at the circumference Convex, and both are aspherical.

The fourth lens L4 has a negative refractive power and is a plastic material, its object side S7 is concave at the near optical axis and at the circumference, its image side S8 is convex at the near optical axis, and its image side S8 is at the circumference. Concave, and all are aspherical.

The fifth lens L5 has a positive refractive power and is a plastic material, its object side S9 is a convex surface at the near optical axis, its object side S9 is a concave surface at the circumference, and its image side S10 is at the near optical axis and at the circumference. Convex, and both are aspherical.

The imaging surface S15 is the surface where the image formed by the light of the subject passing through the optical system is located.

Table 3a shows the characteristic table of the optical system of this embodiment, wherein the radius of curvature in this embodiment is the radius of curvature of each lens at the near optical axis, the reference wavelength of the focal length is 555 nm, the refractive index and the Abbe number are The reference wavelength is 587.56nm.

Table 3a

Table 3b shows the coefficients A4, A6, A8, A4, A6, A8, A10, A12, A14, A16, A18 and A20, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

Table 3b

面序号face number	KK	A4A4	A6A6	A8A8	A10A10
S1S1	1.0000E+011.0000E+01	-2.0188E-01-2.0188E-01	-2.6357E-01-2.6357E-01	3.1528E+003.1528E+00	-2.8736E+01-2.8736E+01
S2S2	1.4343E+001.4343E+00	-5.7997E-01-5.7997E-01	9.9929E-019.9929E-01	-2.9681E+00-2.9681E+00	1.0152E+011.0152E+01
S3S3	-1.0514E+01-1.0514E+01	-2.7988E-01-2.7988E-01	6.7506E-016.7506E-01	-1.8052E+00-1.8052E+00	5.6467E+005.6467E+00
S4S4	-5.0741E+01-5.0741E+01	-2.2683E-01-2.2683E-01	5.1918E-015.1918E-01	-2.6223E+00-2.6223E+00	9.5350E+009.5350E+00
S5S5	-1.3282E+01-1.3282E+01	-3.1702E-01-3.1702E-01	7.3932E-017.3932E-01	-2.7740E+00-2.7740E+00	1.0084E+011.0084E+01
S6S6	-1.6461E+01-1.6461E+01	-6.9620E-02-6.9620E-02	1.8490E-011.8490E-01	-4.0495E-01-4.0495E-01	1.0368E+001.0368E+00
S7S7	-8.3945E-01-8.3945E-01	-1.0043E-01-1.0043E-01	4.0745E-014.0745E-01	-1.3565E+00-1.3565E+00	3.1686E+003.1686E+00
S8S8	0.0000E+000.0000E+00	-2.1874E-01-2.1874E-01	7.7161E-017.7161E-01	-2.1534E+00-2.1534E+00	3.8929E+003.8929E+00
S9S9	1.0000E+011.0000E+01	-1.3454E-01-1.3454E-01	6.3425E-016.3425E-01	-1.4941E+00-1.4941E+00	1.9570E+001.9570E+00
S10S10	-6.9068E+00-6.9068E+00	-1.1845E-01-1.1845E-01	3.9357E-013.9357E-01	-5.4814E-01-5.4814E-01	3.3476E-013.3476E-01
S11S11	3.2535E+003.2535E+00	-1.2974E-01-1.2974E-01	-4.0000E-05-4.0000E-05	3.7800E-033.7800E-03	1.5090E-021.5090E-02
S12S12	-3.5510E+00-3.5510E+00	-1.3954E-01-1.3954E-01	7.9040E-027.9040E-02	-3.4360E-02-3.4360E-02	1.0990E-021.0990E-02

面序号face number	A12A12	A14A14	A16A16	A18A18	A20A20
S1S1	1.5912E+021.5912E+02	-5.3927E+02-5.3927E+02	1.0846E+031.0846E+03	-1.1776E+03-1.1776E+03	5.2943E+025.2943E+02
S2S2	-2.7001E+01-2.7001E+01	4.6044E+014.6044E+01	-4.6179E+01-4.6179E+01	2.6817E+012.6817E+01	-8.0136E+00-8.0136E+00
S3S3	-1.4498E+01-1.4498E+01	2.3491E+012.3491E+01	-2.1791E+01-2.1791E+01	1.0506E+011.0506E+01	-2.0084E+00-2.0084E+00
S4S4	-2.2332E+01-2.2332E+01	3.1463E+013.1463E+01	-2.5671E+01-2.5671E+01	1.1181E+011.1181E+01	-2.0073E+00-2.0073E+00
S5S5	-2.3417E+01-2.3417E+01	3.2525E+013.2525E+01	-2.6234E+01-2.6234E+01	1.1321E+011.1321E+01	-2.0167E+00-2.0167E+00
S6S6	-1.7669E+00-1.7669E+00	1.7802E+001.7802E+00	-9.9037E-01-9.9037E-01	2.5419E-012.5419E-01	-1.5990E-02-1.5990E-02
S7S7	-5.0490E+00-5.0490E+00	5.2040E+005.2040E+00	-3.2833E+00-3.2833E+00	1.1575E+001.1575E+00	-1.7618E-01-1.7618E-01
S8S8	-4.5480E+00-4.5480E+00	3.3918E+003.3918E+00	-1.5506E+00-1.5506E+00	3.9649E-013.9649E-01	-4.3560E-02-4.3560E-02
S9S9	-1.5652E+00-1.5652E+00	7.8765E-017.8765E-01	-2.4303E-01-2.4303E-01	4.1520E-024.1520E-02	-2.9600E-03-2.9600E-03
S10S10	-2.0050E-02-2.0050E-02	-7.7810E-02-7.7810E-02	4.0170E-024.0170E-02	-8.2800E-03-8.2800E-03	6.4000E-046.4000E-04
S11S11	-1.0050E-02-1.0050E-02	2.8200E-032.8200E-03	-4.2000E-04-4.2000E-04	3.0000E-053.0000E-05	0.0000E+000.0000E+00
S12S12	-2.4800E-03-2.4800E-03	3.8000E-043.8000E-04	-4.0000E-05-4.0000E-05	0.0000E+000.0000E+00	0.0000E+000.0000E+00

FIG. 7 shows longitudinal spherical aberration curves, astigmatism curves, and distortion curves of the optical system of the third embodiment. Among them, the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical system, and the reference wavelengths of the longitudinal spherical aberration curve are 650.0000nm, 610.0000nm, 555.0000nm, 510.0000nm, 470.0000nm; the astigmatism curve represents Meridional image surface curvature and sagittal image surface curvature, where S represents the sagittal direction, T represents the meridional direction, and the reference wavelength of the astigmatism curve is 555.0000 nm; the distortion curve represents the distortion value corresponding to different field angles. The reference wavelength is 555.0000nm. It can be seen from FIG. 7 that the optical system provided in the third embodiment can achieve good imaging quality.

Embodiment 4

As shown in FIG. 8 , the straight line 11 represents the optical axis, the side of the first lens L1 away from the second lens L2 is the object side 12 , and the side of the sixth lens L6 away from the fifth lens L5 is the image side 13 . In the optical system provided in this embodiment, from the object side 12 to the image side 13 are the diaphragm STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the Six lenses L6, infrared filter element IRCF.

The first lens L1 has a negative refractive power and is made of plastic material, its object side S1 is convex at the near optical axis, its object side S1 is concave at the circumference, and its image side S2 is concave at the near optical axis, and its image is concave at the near optical axis. The side surface S2 is convex at the circumference, and both are aspherical.

The third lens L3 has a negative refractive power and is made of plastic material. Its object side S5 is concave at the near optical axis, its object side S5 is convex at the circumference, and its image side S6 is at the near optical axis and at the circumference. Concave, and both are aspherical.

Table 4a shows the characteristic table of the optical system of this embodiment, wherein the radius of curvature in this embodiment is the radius of curvature of each lens at the near optical axis, the reference wavelength of the focal length is 555 nm, the refractive index and the Abbe number are The reference wavelength is 587.56nm.

Table 4a

Table 4b shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

Table 4b

面序号face number	KK	A4A4	A6A6	A8A8	A10A10
S1S1	-5.0303E+00-5.0303E+00	-1.2788E-01-1.2788E-01	-4.5166E-01-4.5166E-01	5.0773E+005.0773E+00	-3.6482E+01-3.6482E+01
S2S2	-1.0000E+01-1.0000E+01	-5.2726E-01-5.2726E-01	1.4553E-011.4553E-01	2.0485E+002.0485E+00	-1.3204E+01-1.3204E+01
S3S3	-1.0600E+01-1.0600E+01	-1.3841E-01-1.3841E-01	-1.5239E-01-1.5239E-01	8.9238E-018.9238E-01	-3.0736E+00-3.0736E+00
S4S4	-5.5875E+01-5.5875E+01	-5.7190E-02-5.7190E-02	-6.1487E-01-6.1487E-01	8.8623E-018.8623E-01	2.7063E+002.7063E+00
S5S5	-1.3282E+01-1.3282E+01	-1.6042E-01-1.6042E-01	-5.6777E-01-5.6777E-01	9.3647E-019.3647E-01	5.9862E+005.9862E+00
S6S6	-1.5292E+01-1.5292E+01	-5.6960E-02-5.6960E-02	-1.0715E-01-1.0715E-01	3.5324E-013.5324E-01	1.1292E+001.1292E+00
S7S7	-1.0000E+01-1.0000E+01	-9.8970E-02-9.8970E-02	4.2340E-014.2340E-01	-1.1712E+00-1.1712E+00	1.9593E+001.9593E+00
S8S8	-1.0000E+01-1.0000E+01	-2.0616E-01-2.0616E-01	6.1478E-016.1478E-01	-1.5141E+00-1.5141E+00	2.4463E+002.4463E+00
S9S9	1.0000E+011.0000E+01	-5.7890E-02-5.7890E-02	3.1303E-013.1303E-01	-9.3515E-01-9.3515E-01	1.3944E+001.3944E+00
S10S10	-7.7050E+00-7.7050E+00	-4.5020E-02-4.5020E-02	2.4893E-012.4893E-01	-4.7782E-01-4.7782E-01	3.9457E-013.9457E-01
S11S11	4.6983E+004.6983E+00	-2.1402E-01-2.1402E-01	1.1264E-011.1264E-01	-1.1842E-01-1.1842E-01	1.0452E-011.0452E-01
S12S12	-4.2697E+00-4.2697E+00	-1.3359E-01-1.3359E-01	7.7690E-027.7690E-02	-3.5400E-02-3.5400E-02	1.1650E-021.1650E-02
面序号face number	A12A12	A14A14	A16A16	A18A18	A20A20
S1S1	1.5896E+021.5896E+02	-4.2915E+02-4.2915E+02	6.9954E+026.9954E+02	-6.2666E+02-6.2666E+02	2.3526E+022.3526E+02
S2S2	4.8937E+014.8937E+01	-1.1044E+02-1.1044E+02	1.4834E+021.4834E+02	-1.0777E+02-1.0777E+02	3.2247E+013.2247E+01
S3S3	9.3150E+009.3150E+00	-1.8841E+01-1.8841E+01	2.2847E+012.2847E+01	-1.4934E+01-1.4934E+01	4.0222E+004.0222E+00
S4S4	-1.1558E+01-1.1558E+01	1.7565E+011.7565E+01	-1.3461E+01-1.3461E+01	5.1827E+005.1827E+00	-7.9192E-01-7.9192E-01
S5S5	-2.3337E+01-2.3337E+01	3.6197E+013.6197E+01	-2.9331E+01-2.9331E+01	1.2284E+011.2284E+01	-2.1021E+00-2.1021E+00
S6S6	-4.6231E+00-4.6231E+00	6.6913E+006.6913E+00	-4.9868E+00-4.9868E+00	1.9178E+001.9178E+00	-3.0162E-01-3.0162E-01
S7S7	-2.2686E+00-2.2686E+00	1.8811E+001.8811E+00	-1.0293E+00-1.0293E+00	3.2408E-013.2408E-01	-4.4520E-02-4.4520E-02
S8S8	-2.5692E+00-2.5692E+00	1.7044E+001.7044E+00	-6.6740E-01-6.6740E-01	1.3583E-011.3583E-01	-1.0370E-02-1.0370E-02
S9S9	-1.1851E+00-1.1851E+00	6.0039E-016.0039E-01	-1.7605E-01-1.7605E-01	2.6050E-022.6050E-02	-1.2900E-03-1.2900E-03
S10S10	-1.0092E-01-1.0092E-01	-4.2240E-02-4.2240E-02	3.3130E-023.3130E-02	-7.7600E-03-7.7600E-03	6.4000E-046.4000E-04
S11S11	-4.9050E-02-4.9050E-02	1.2910E-021.2910E-02	-1.9500E-03-1.9500E-03	1.6000E-041.6000E-04	-1.0000E-05-1.0000E-05
S12S12	-2.5500E-03-2.5500E-03	3.5000E-043.5000E-04	-3.0000E-05-3.0000E-05	0.0000E+000.0000E+00	0.0000E+000.0000E+00

FIG. 9 shows longitudinal spherical aberration curves, astigmatism curves, and distortion curves of the optical system of the fourth embodiment. Among them, the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical system, and the reference wavelengths of the longitudinal spherical aberration curve are 650.0000nm, 610.0000nm, 555.0000nm, 510.0000nm, 470.0000nm; the astigmatism curve represents Meridional image surface curvature and sagittal image surface curvature, where S represents the sagittal direction, T represents the meridional direction, and the reference wavelength of the astigmatism curve is 555.0000 nm; the distortion curve represents the distortion value corresponding to different field angles. The reference wavelength is 555.0000nm. It can be seen from FIG. 9 that the optical system provided in the fourth embodiment can achieve good imaging quality.

Embodiment 5

As shown in FIG. 10 , the straight line 11 represents the optical axis, the side of the first lens L1 away from the second lens L2 is the object side 12 , and the side of the sixth lens L6 away from the fifth lens L5 is the image side 13 . In the optical system provided in this embodiment, from the object side 12 to the image side 13 are the diaphragm STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the Six lenses L6, infrared filter element IRCF.

The first lens L1 has a positive refractive power and is made of plastic material. Its object side S1 is convex at the near optical axis, its object side S1 is concave at the circumference, and its image side S2 is at the near optical axis and at the circumference. Concave, and both are aspherical.

The fourth lens L4 has a negative refractive power and is made of plastic material, its object side S7 is convex at the near optical axis, its object side S7 is concave at the circumference, its image side S8 is concave at the near optical axis, and its image is concave at the near optical axis. The side surface S8 is convex at the circumference, and all are aspherical.

Table 5a shows the characteristic table of the optical system of this embodiment, wherein the radius of curvature in this embodiment is the radius of curvature of each lens at the near optical axis, the reference wavelength of the focal length is 555 nm, the refractive index and the Abbe number are The reference wavelength is 587.56nm.

Table 5a

Table 5b shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

Table 5b

面序号face number	KK	A4A4	A6A6	A8A8	A10A10
S1S1	-5.3372E+00-5.3372E+00	-5.4730E-02-5.4730E-02	-2.8221E-01-2.8221E-01	1.8614E+001.8614E+00	-1.1933E+01-1.1933E+01
S2S2	-1.0000E+01-1.0000E+01	-3.0573E-01-3.0573E-01	-9.4780E-02-9.4780E-02	-5.5970E-02-5.5970E-02	-3.9652E-01-3.9652E-01
S3S3	-1.3117E+01-1.3117E+01	-1.6924E-01-1.6924E-01	7.7710E-027.7710E-02	-1.3297E+00-1.3297E+00	5.0669E+005.0669E+00
S4S4	-6.5162E+01-6.5162E+01	-4.1460E-02-4.1460E-02	-1.1330E+00-1.1330E+00	5.7237E+005.7237E+00	-1.6020E+01-1.6020E+01
S5S5	6.7180E+006.7180E+00	-8.7590E-02-8.7590E-02	-1.8933E+00-1.8933E+00	1.0595E+011.0595E+01	-2.8085E+01-2.8085E+01
S6S6	-1.5331E+01-1.5331E+01	-1.1350E-02-1.1350E-02	-8.0935E-01-8.0935E-01	4.1166E+004.1166E+00	-9.2497E+00-9.2497E+00
S7S7	-1.0000E+01-1.0000E+01	-9.2000E-02-9.2000E-02	6.4453E-016.4453E-01	-2.5858E+00-2.5858E+00	5.6815E+005.6815E+00
S8S8	-8.3780E+00-8.3780E+00	-2.9054E-01-2.9054E-01	1.1703E+001.1703E+00	-3.1574E+00-3.1574E+00	5.1548E+005.1548E+00
S9S9	-4.0870E+00-4.0870E+00	-1.1143E-01-1.1143E-01	5.5269E-015.5269E-01	-1.3804E+00-1.3804E+00	1.8315E+001.8315E+00
S10S10	-9.4434E+00-9.4434E+00	8.1400E-038.1400E-03	1.5186E-011.5186E-01	-3.3174E-01-3.3174E-01	2.8484E-012.8484E-01
S11S11	4.4823E+004.4823E+00	-2.1041E-01-2.1041E-01	1.1330E-011.1330E-01	-7.4850E-02-7.4850E-02	5.2040E-025.2040E-02
S12S12	-4.5141E+00-4.5141E+00	-1.4186E-01-1.4186E-01	1.0550E-011.0550E-01	-6.1170E-02-6.1170E-02	2.5730E-022.5730E-02
面序号face number	A12A12	A14A14	A16A16	A18A18	A20A20
S1S1	4.3636E+014.3636E+01	-9.7592E+01-9.7592E+01	1.3095E+021.3095E+02	-9.6166E+01-9.6166E+01	2.9648E+012.9648E+01
S2S2	6.7242E+006.7242E+00	-2.0188E+01-2.0188E+01	2.8164E+012.8164E+01	-1.9521E+01-1.9521E+01	5.4267E+005.4267E+00
S3S3	-8.1453E+00-8.1453E+00	7.5732E+007.5732E+00	-4.4810E+00-4.4810E+00	1.6004E+001.6004E+00	-2.5899E-01-2.5899E-01
S4S4	2.6803E+012.6803E+01	-2.7357E+01-2.7357E+01	1.6776E+011.6776E+01	-5.7155E+00-5.7155E+00	8.3805E-018.3805E-01
S5S5	4.3672E+014.3672E+01	-4.1691E+01-4.1691E+01	2.3987E+012.3987E+01	-7.6191E+00-7.6191E+00	1.0253E+001.0253E+00
S6S6	1.2119E+011.2119E+01	-9.7784E+00-9.7784E+00	4.7675E+004.7675E+00	-1.2802E+00-1.2802E+00	1.4433E-011.4433E-01
S7S7	-7.5217E+00-7.5217E+00	6.1552E+006.1552E+00	-3.0376E+00-3.0376E+00	8.2883E-018.2883E-01	-9.6280E-02-9.6280E-02

S8S8	-5.2271E+00-5.2271E+00	3.2922E+003.2922E+00	-1.2428E+00-1.2428E+00	2.5628E-012.5628E-01	-2.2150E-02-2.2150E-02
S9S9	-1.4124E+00-1.4124E+00	6.3482E-016.3482E-01	-1.5227E-01-1.5227E-01	1.3610E-021.3610E-02	4.9000E-044.9000E-04
S10S10	-8.2840E-02-8.2840E-02	-2.1970E-02-2.1970E-02	2.0770E-022.0770E-02	-5.0800E-03-5.0800E-03	4.3000E-044.3000E-04
S11S11	-2.2360E-02-2.2360E-02	5.5800E-035.5800E-03	-8.1000E-04-8.1000E-04	6.0000E-056.0000E-05	0.0000E+000.0000E+00
S12S12	-7.3500E-03-7.3500E-03	1.3600E-031.3600E-03	-1.5000E-04-1.5000E-04	1.0000E-051.0000E-05	0.0000E+000.0000E+00

FIG. 11 shows longitudinal spherical aberration curves, astigmatism curves, and distortion curves of the optical system of the fifth embodiment. Among them, the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical system, and the reference wavelengths of the longitudinal spherical aberration curve are 650.0000nm, 610.0000nm, 555.0000nm, 510.0000nm, 470.0000nm; the astigmatism curve represents Meridional image surface curvature and sagittal image surface curvature, where S represents the sagittal direction, T represents the meridional direction, and the reference wavelength of the astigmatism curve is 555.0000 nm; the distortion curve represents the distortion value corresponding to different field angles. The reference wavelength is 555.0000nm. It can be seen from FIG. 11 that the optical system provided in the fifth embodiment can achieve good imaging quality.

Embodiment 6

As shown in FIG. 12 , the straight line 11 represents the optical axis, the side of the first lens L1 away from the second lens L2 is the object side 12 , and the side of the sixth lens L6 away from the fifth lens L5 is the image side 13 . In the optical system provided in this embodiment, from the object side 12 to the image side 13 are the diaphragm STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the Six lenses L6, infrared filter element IRCF.

The first lens L1 has a positive refractive power and is made of plastic material, its object side S1 is convex at the near optical axis, its object side S1 is concave at the circumference, its image side S2 is concave at the near optical axis, and its image is concave at the near optical axis. The side surface S2 is convex at the circumference, and both are aspherical.

The second lens L2 has positive refractive power and is made of plastic material, its object side S3 is convex at the near optical axis and at the circumference, its image side S4 is convex at the near optical axis, and its image side S4 is at the circumference Concave, and both are aspherical.

The sixth lens L6 has a negative refractive power and is made of plastic material, its object side S11 is concave at the near optical axis and at the circumference, its image side S12 is concave at the near optical axis, and its image side S12 is at the circumference. Convex, and both are aspherical.

Table 6a shows the characteristic table of the optical system of this embodiment, wherein the radius of curvature in this embodiment is the radius of curvature of each lens at the near optical axis, the reference wavelength of the focal length is 555 nm, the refractive index and the Abbe number are The reference wavelength is 587.56nm.

Table 6a

Table 6b shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

Table 6b

面序号face number	KK	A4A4	A6A6	A8A8	A10A10
S1S1	-5.2278E+00-5.2278E+00	-4.3030E-02-4.3030E-02	-1.9774E-01-1.9774E-01	1.0335E+001.0335E+00	-5.6919E+00-5.6919E+00
S2S2	-9.7048E-01-9.7048E-01	-2.5359E-01-2.5359E-01	-2.8437E-01-2.8437E-01	1.3071E+001.3071E+00	-5.4460E+00-5.4460E+00
S3S3	-1.8711E+01-1.8711E+01	-8.7420E-02-8.7420E-02	-2.8315E-01-2.8315E-01	6.1699E-016.1699E-01	-1.7832E+00-1.7832E+00
S4S4	-5.0741E+01-5.0741E+01	1.2430E-021.2430E-02	-1.6414E+00-1.6414E+00	6.9418E+006.9418E+00	-1.7000E+01-1.7000E+01
S5S5	6.7180E+006.7180E+00	5.2000E-035.2000E-03	-2.0151E+00-2.0151E+00	8.8159E+008.8159E+00	-2.0436E+01-2.0436E+01
S6S6	-1.0718E+01-1.0718E+01	5.7920E-025.7920E-02	-6.7380E-01-6.7380E-01	2.5875E+002.5875E+00	-5.1672E+00-5.1672E+00
S7S7	-1.0000E+01-1.0000E+01	2.9540E-022.9540E-02	2.4827E-012.4827E-01	-1.3839E+00-1.3839E+00	3.3061E+003.3061E+00

S8S8	-1.0000E+01-1.0000E+01	-1.7645E-01-1.7645E-01	7.4745E-017.4745E-01	-2.1257E+00-2.1257E+00	3.6018E+003.6018E+00
S9S9	-5.2096E+00-5.2096E+00	-2.3598E-01-2.3598E-01	6.8691E-016.8691E-01	-1.3051E+00-1.3051E+00	1.5060E+001.5060E+00
S10S10	-5.3051E+00-5.3051E+00	-7.6150E-02-7.6150E-02	1.9470E-011.9470E-01	-1.7831E-01-1.7831E-01	-2.0190E-02-2.0190E-02
S11S11	-8.9880E+00-8.9880E+00	-7.2770E-02-7.2770E-02	-3.6900E-03-3.6900E-03	-9.8800E-03-9.8800E-03	2.9490E-022.9490E-02
S12S12	-4.6217E+00-4.6217E+00	-1.0397E-01-1.0397E-01	6.0500E-026.0500E-02	-2.7190E-02-2.7190E-02	8.7300E-038.7300E-03
面序号face number	A12A12	A14A14	A16A16	A18A18	A20A20
S1S1	1.8459E+011.8459E+01	-3.7879E+01-3.7879E+01	4.7494E+014.7494E+01	-3.2739E+01-3.2739E+01	9.4308E+009.4308E+00
S2S2	1.5738E+011.5738E+01	-2.7724E+01-2.7724E+01	2.9107E+012.9107E+01	-1.6689E+01-1.6689E+01	4.0013E+004.0013E+00
S3S3	4.7218E+004.7218E+00	-6.5108E+00-6.5108E+00	4.7487E+004.7487E+00	-1.7950E+00-1.7950E+00	2.8461E-012.8461E-01
S4S4	2.6840E+012.6840E+01	-2.7846E+01-2.7846E+01	1.8310E+011.8310E+01	-6.8952E+00-6.8952E+00	1.1318E+001.1318E+00
S5S5	2.9921E+012.9921E+01	-2.8804E+01-2.8804E+01	1.7639E+011.7639E+01	-6.1797E+00-6.1797E+00	9.3765E-019.3765E-01
S6S6	6.4196E+006.4196E+00	-5.1724E+00-5.1724E+00	2.6393E+002.6393E+00	-7.7480E-01-7.7480E-01	9.9770E-029.9770E-02
S7S7	-4.6451E+00-4.6451E+00	4.1047E+004.1047E+00	-2.2299E+00-2.2299E+00	6.7799E-016.7799E-01	-8.8270E-02-8.8270E-02
S8S8	-3.8404E+00-3.8404E+00	2.6141E+002.6141E+00	-1.0977E+00-1.0977E+00	2.5852E-012.5852E-01	-2.6140E-02-2.6140E-02
S9S9	-1.0978E+00-1.0978E+00	5.1246E-015.1246E-01	-1.4850E-01-1.4850E-01	2.4050E-022.4050E-02	-1.6400E-03-1.6400E-03
S10S10	1.6409E-011.6409E-01	-1.2642E-01-1.2642E-01	4.4360E-024.4360E-02	-7.6300E-03-7.6300E-03	5.2000E-045.2000E-04
S11S11	-1.7630E-02-1.7630E-02	5.0400E-035.0400E-03	-7.8000E-04-7.8000E-04	6.0000E-056.0000E-05	0.0000E+000.0000E+00
S12S12	-1.9000E-03-1.9000E-03	2.7000E-042.7000E-04	-2.0000E-05-2.0000E-05	0.0000E+000.0000E+00	0.0000E+000.0000E+00

FIG. 13 shows longitudinal spherical aberration curves, astigmatism curves, and distortion curves of the optical system of the sixth embodiment. Among them, the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical system, and the reference wavelengths of the longitudinal spherical aberration curve are 650.0000nm, 610.0000nm, 555.0000nm, 510.0000nm, 470.0000nm; the astigmatism curve represents Meridional image surface curvature and sagittal image surface curvature, where S represents the sagittal direction, T represents the meridional direction, and the reference wavelength of the astigmatism curve is 555.0000 nm; the distortion curve represents the distortion value corresponding to different field angles. The reference wavelength is 555.0000nm. It can be seen from FIG. 13 that the optical system provided in the sixth embodiment can achieve good imaging quality.

Table 7 shows the values of cts/sds, slopeL1S1, f12/f36, (R61+R62)/(R61-R62), FNO, TTL/f, and TTL/Imgh of the optical systems of the first to sixth embodiments.

Table 7

It can be seen from Table 7 that each embodiment can satisfy: 0.1<cts/sds<2, -20°<slopeL1S1<-0.5°, -1<f12/f36<-0.3, 0<(R61+R62)/(R61 -R62)<2, 2<FNO<4, 1.25<TTL/f<1.5, 1.5<TTL/Imgh<1.7.

Referring to FIG. 14 , the optical system involved in the present application is applied to the camera module 20 in the terminal device 30 . The terminal device 30 may be a mobile phone, a tablet computer, a drone, a computer, or other devices. The photosensitive element of the camera module 20 is located on the image side of the optical system, and the camera module 20 is assembled inside the terminal device 30 .

The application provides a camera module, including a photosensitive element and the optical system provided in the embodiment of the application, the photosensitive element is located on the image side of the optical system, and is used to pass through the first lens to the sixth lens and be incident on the electronic photosensitive element The light is converted into an electrical signal of the image. The electronic photosensitive element can be a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) or a charge-coupled device (Charge-coupled Device, CCD). By installing the optical system in the camera module, miniaturization, a large field of view, and high-pixel imaging quality can be achieved, and the opening size of the terminal device can be reduced.

The present application further provides a terminal device, where the terminal device includes the camera module provided by the embodiment of the present application. The terminal device may be a mobile phone, a tablet computer, a drone, a computer, and the like. By installing the camera module in the terminal device, the terminal device can achieve miniaturization, a large field of view, and high-pixel imaging quality, and the size of the opening of the terminal device can be reduced.

The above are the preferred embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present application, several improvements and modifications can also be made, and these improvements and modifications may also be regarded as The protection scope of this application.

Claims

An optical system, characterized in that it includes a plurality of lenses, and the plurality of lenses include:

the first lens, having refractive power;

The second lens has a positive refractive power, and both the object side and the image side of the second lens are convex at the near optical axis;

The third lens has a negative refractive power, and the image side surface of the third lens is concave at the near optical axis;

the fourth lens, with refractive power;

The fifth lens has a positive refractive power, and the image side surface of the fifth lens is convex at the near optical axis;

The sixth lens has a negative refractive power, and the image side surface of the sixth lens is concave at the near optical axis;

The optical system further includes a diaphragm, and the optical system satisfies the following conditional formula:

0.1<cts/sds<2,

cts is the distance from the intersection of the diaphragm and the optical axis to the intersection of the object side surface of the first lens and the optical axis, and sds is half of the aperture of the diaphragm.
The optical system according to claim 1, wherein the object side surface and the image side surface of the first lens to the sixth lens are all aspherical surfaces.
The optical system according to claim 1, wherein the optical system satisfies the conditional expression:

-20°<slopeL1S1<-0.5°,

slopeL1S1 is the slope angle at the maximum effective aperture of the object side of the first lens.
The optical system according to claim 1, wherein the optical system satisfies the conditional expression:

-1<f12/f36<-0.3,

f12 is the combined focal length of the first lens and the second lens, and f36 is the combined focal length of the third lens to the sixth lens.
The optical system according to claim 1, wherein the optical system satisfies the conditional expression:

0<(R61+R62)/(R61-R62)<2,

R61 is the radius of curvature of the object side of the sixth lens at the optical axis, and R62 is the radius of curvature of the image side of the sixth lens at the optical axis.
The optical system according to claim 1, wherein the optical system satisfies the conditional expression:

2<FNO<4,

FNO is the aperture number of the optical system.
The optical system according to claim 1, wherein the optical system satisfies the conditional expression:

1.25<TTL/f<1.5,

TTL is the distance from the object side of the first lens in the optical system to the imaging surface on the optical axis, and f is the focal length of the optical system.
The optical system according to claim 1, wherein the optical system satisfies the conditional expression:

1.5<TTL/Imgh<1.7,

TTL is the distance from the object side of the first lens in the optical system to the imaging surface on the optical axis, and ImgH is half of the image height corresponding to the maximum angle of view of the optical system.
A camera module, comprising a photosensitive element and the optical system according to any one of claims 1 to 8, wherein the photosensitive element is located on the image side of the optical system.
A terminal device, comprising the camera module according to claim 9.